Dock step



FIG. 1 is a front-top-right perspective view of a dock step showing my new design;

FIG. 2 is a front-bottom-left perspective view thereof;

FIG. 3 is a rear-bottom-left perspective view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a left elevational view thereof; and,

FIG. 9 is a right elevational view thereof. 

CLAIM The ornamental design for a dock step, as shown and described. 